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FIX: Check for colorbar creation with multi-dimensional alpha #20788

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Merged
merged 1 commit into from
Aug 6, 2021
Merged

FIX: Check for colorbar creation with multi-dimensional alpha #20788

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13 changes: 10 additions & 3 deletions lib/matplotlib/colorbar.py
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Original file line number Diff line number Diff line change
Expand Up @@ -427,7 +427,9 @@ def __init__(self, ax, mappable=None, *, cmap=None,
extend = norm.extend
else:
extend = 'neither'
self.alpha = alpha
self.alpha = None
# Call set_alpha to handle array-like alphas properly
self.set_alpha(alpha)
self.cmap = cmap
self.norm = norm
self.values = values
Expand Down Expand Up @@ -934,8 +936,13 @@ def set_label(self, label, *, loc=None, **kwargs):
self.stale = True

def set_alpha(self, alpha):
"""Set the transparency between 0 (transparent) and 1 (opaque)."""
self.alpha = alpha
"""
Set the transparency between 0 (transparent) and 1 (opaque).

If an array is provided, *alpha* will be set to None to use the
transparency values associated with the colormap.
"""
self.alpha = None if isinstance(alpha, np.ndarray) else alpha

def _set_scale(self, scale, **kwargs):
"""
Expand Down
12 changes: 12 additions & 0 deletions lib/matplotlib/tests/test_colorbar.py
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Original file line number Diff line number Diff line change
Expand Up @@ -604,6 +604,18 @@ def test_mappable_no_alpha():
plt.draw()


def test_mappable_2d_alpha():
fig, ax = plt.subplots()
x = np.arange(1, 5).reshape(2, 2)/4
pc = ax.pcolormesh(x, alpha=x)
cb = fig.colorbar(pc, ax=ax)
# The colorbar's alpha should be None and the mappable should still have
# the original alpha array
assert cb.alpha is None
assert pc.get_alpha() is x
fig.draw_no_output()


def test_colorbar_label():
"""
Test the label parameter. It should just be mapped to the xlabel/ylabel of
Expand Down